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fix #27440 amd #27649 and some examples

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@159507 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Nuno Lopes 2004-05-24 14:07:35 +00:00
parent f40751d832
commit 15d583e6a3
1 changed files with 9 additions and 131 deletions
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140
appendices/migration5.xml
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@ -1,5 +1,5 @@
<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.17 $ -->
<!-- $Revision: 1.18 $ -->
<appendix id="migration5">
<title>Migrating from PHP 4 to PHP 5</title>
@ -69,9 +69,6 @@
<listitem><simpara>
An object with no properties is no longer considered "empty".
</simpara></listitem>
<listitem><simpara>
Classes must be declared before used.
</simpara></listitem>
</itemizedlist>
<para>
@ -105,29 +102,6 @@ if (!$t) {
}
?>
]]>
</programlisting>
</example>
</para>
<para>
The following example was valid in &php; 4, although it will produce a fatal
error in &php; 5.
</para>
<para>
<example>
<title>Classes must be declared before used</title>
<programlisting role="php">
<![CDATA[
<?php
$test = new fubar();
$test->barfu();
class fubar {
function barfu() {
echo 'fubar';
}
}
?>
]]>
</programlisting>
</example>
@ -1097,112 +1071,16 @@ echo "Foo::constant = " . Foo::constant . "\n";
<programlisting role="php">
<![CDATA[
<?php
class MyException {
function __construct($exception) {
$this->exception = $exception;
}
function Display() {
print "MyException: $this->exception\n";
}
}
class MyExceptionFoo extends MyException {
function __construct($exception) {
$this->exception = $exception;
}
function Display() {
print "MyException: $this->exception\n";
}
}
try {
throw new MyExceptionFoo('Hello');
}
catch (MyException $exception) {
$exception->Display();
throw new Exception('Hello');
}
catch (Exception $exception) {
echo $exception;
echo $exception;
}
?>
]]>
</programlisting>
</example>
<para>
Even though the above example shows that it is possible to define
exception classes that don't inherit from Exception it is best to do so.
This is because the internal Exception class can gather a lot of
information otherwise not available. The &php; code emulation code would
look something like shown below. The comments show the meaning of each
property and hence their getter methods. As the code shows it is possible
to read any available information by using the getter methods. But since
some of the methods are used internally they are marked final. All in all
the class is very restrictive because it must be ensured that anything
used internally always works as expected.
</para>
<example>
<title>Base exceptions class</title>
<programlisting role="php">
<![CDATA[
<?php
class Exception {
function __construct(string $message=NULL, int code=0) {
if (func_num_args()) {
$this->message = $message;
}
$this->code = $code;
$this->file = __FILE__; // of throw clause
$this->line = __LINE__; // of throw clause
$this->trace = debug_backtrace();
$this->string = StringFormat($this);
}
protected $message = 'Unknown exception'; // exception message
protected $code = 0; // user defined exception code
protected $file; // source filename of exception
protected $line; // source line of exception
private $trace; // backtrace of exception
private $string; // internal only!!
final function getMessage() {
return $this->message;
}
final function getCode() {
return $this->code;
}
final function getFile() {
return $this->file;
}
final function getTrace() {
return $this->trace;
}
final function getTraceAsString() {
return self::TraceFormat($this);
}
function _toString() {
return $this->string;
}
static private function StringFormat(Exception $exception) {
// ... a function not available in PHP scripts
// that returns all relevant information as a string
}
static private function TraceFormat(Exception $exception) {
// ... a function not available in PHP scripts
// that returns the backtrace as a string
}
}
?>
]]>
</programlisting>
</example>
<simpara>
If you derive your exception classes from this Exception base class your
exceptions will be nicely shown in the built-in handler for uncaught
exceptions.
</simpara>
<simpara>
Old code that has no user-defined classes or functions 'catch', 'throw'
and 'try' will run without modifications.
@ -1552,7 +1430,7 @@ foreach($obj as $key => $val) {
// matches the following 7 lines with the for directive.
$it = $obj->getIterator();
for($it->rewind(); $it->hasMore(); $it->next) {
for($it->rewind(); $it->valid(); $it->next()) {
$key = $it->current();
$val = $it->key();
echo "$key = $val\n";
@ -1655,11 +1533,11 @@ class Foo {
}
}
reflection_class::export('Foo');
reflection_object::export(new Foo);
reflection_method::export('Foo', 'func');
reflection_property::export('Foo', 'prop');
reflection_extension::export('standard');
reflectionClass::export('Foo');
reflectionObject::export(new Foo);
reflectionMethod::export('Foo', 'func');
reflectionProperty::export('Foo', 'prop');
reflectionExtension::export('standard');
?>
]]>
</programlisting>